libgfortran/runtime/stop.c

   1 /* Implementation of the STOP statement.
   2    Copyright (C) 2002-2013 Free Software Foundation, Inc.
   3    Contributed by Paul Brook <paul@nowt.org>
   4
   5 This file is part of the GNU Fortran runtime library (libgfortran).
   6
   7 Libgfortran is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU General Public
   9 License as published by the Free Software Foundation; either
  10 version 3 of the License, or (at your option) any later version.
  11
  12 Libgfortran is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #include "libgfortran.h"
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #ifdef HAVE_UNISTD_H
  31 #include <unistd.h>
  32 #endif
  33
  34
  35 /* Fortran 2008 demands: If any exception (14) is signaling on that image, the
  36    processor shall issue a warning indicating which exceptions are signaling;
  37    this warning shall be on the unit identified by the named constant
  38    ERROR_UNIT (13.8.2.8).  In line with other compilers, we do not report
  39    inexact - and we optionally ignore underflow, cf. thread starting at
  40    http://mailman.j3-fortran.org/pipermail/j3/2013-June/006452.html.  */
  41
  42 static void
  43 report_exception (void)
  44 {
  45   int set_excepts;
  46
  47   if (!compile_options.fpe_summary)
  48     return;
  49
  50   set_excepts = get_fpu_except_flags ();
  51   if ((set_excepts & compile_options.fpe_summary) == 0)
  52     return;
  53
  54   estr_write ("Note: The following floating-point exceptions are signalling:");
  55
  56   if ((compile_options.fpe_summary & GFC_FPE_INVALID)
  57       && (set_excepts & GFC_FPE_INVALID))
  58     estr_write (" IEEE_INVALID_FLAG");
  59
  60   if ((compile_options.fpe_summary & GFC_FPE_ZERO)
  61       && (set_excepts & GFC_FPE_ZERO))
  62     estr_write (" IEEE_DIVIDE_BY_ZERO");
  63
  64   if ((compile_options.fpe_summary & GFC_FPE_OVERFLOW)
  65       && (set_excepts & GFC_FPE_OVERFLOW))
  66     estr_write (" IEEE_OVERFLOW_FLAG");
  67
  68   if ((compile_options.fpe_summary & GFC_FPE_UNDERFLOW)
  69       && (set_excepts & GFC_FPE_UNDERFLOW))
  70     estr_write (" IEEE_UNDERFLOW_FLAG");
  71
  72   if ((compile_options.fpe_summary & GFC_FPE_DENORMAL)
  73       && (set_excepts & GFC_FPE_DENORMAL))
  74     estr_write (" IEEE_DENORMAL");
  75
  76   if ((compile_options.fpe_summary & GFC_FPE_INEXACT)
  77       && (set_excepts & GFC_FPE_INEXACT))
  78     estr_write (" IEEE_INEXACT_FLAG");
  79
  80   estr_write ("\n");
  81 }
  82
  83
  84 /* A numeric STOP statement.  */
  85
  86 extern void stop_numeric (GFC_INTEGER_4)
  87   __attribute__ ((noreturn));
  88 export_proto(stop_numeric);
  89
  90 void
  91 stop_numeric (GFC_INTEGER_4 code)
  92 {
  93   report_exception ();
  94   if (code == -1)
  95     code = 0;
  96   else
  97     st_printf ("STOP %d\n", (int)code);
  98
  99   exit (code);
 100 }
 101
 102
 103 /* A Fortran 2008 numeric STOP statement.  */
 104
 105 extern void stop_numeric_f08 (GFC_INTEGER_4)
 106   __attribute__ ((noreturn));
 107 export_proto(stop_numeric_f08);
 108
 109 void
 110 stop_numeric_f08 (GFC_INTEGER_4 code)
 111 {
 112   report_exception ();
 113   st_printf ("STOP %d\n", (int)code);
 114   exit (code);
 115 }
 116
 117
 118 /* A character string or blank STOP statement.  */
 119
 120 void
 121 stop_string (const char *string, GFC_INTEGER_4 len)
 122 {
 123   report_exception ();
 124   if (string)
 125     {
 126       estr_write ("STOP ");
 127       (void) write (STDERR_FILENO, string, len);
 128       estr_write ("\n");
 129     }
 130   exit (0);
 131 }
 132
 133
 134 /* Per Fortran 2008, section 8.4:  "Execution of a STOP statement initiates
 135    normal termination of execution. Execution of an ERROR STOP statement
 136    initiates error termination of execution."  Thus, error_stop_string returns
 137    a nonzero exit status code.  */
 138
 139 extern void error_stop_string (const char *, GFC_INTEGER_4)
 140   __attribute__ ((noreturn));
 141 export_proto(error_stop_string);
 142
 143 void
 144 error_stop_string (const char *string, GFC_INTEGER_4 len)
 145 {
 146   report_exception ();
 147   estr_write ("ERROR STOP ");
 148   (void) write (STDERR_FILENO, string, len);
 149   estr_write ("\n");
 150
 151   exit (1);
 152 }
 153
 154
 155 /* A numeric ERROR STOP statement.  */
 156
 157 extern void error_stop_numeric (GFC_INTEGER_4)
 158   __attribute__ ((noreturn));
 159 export_proto(error_stop_numeric);
 160
 161 void
 162 error_stop_numeric (GFC_INTEGER_4 code)
 163 {
 164   report_exception ();
 165   st_printf ("ERROR STOP %d\n", (int) code);
 166   exit (code);
 167 }